<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>布局练习</title>
    <style>
        div>div>div{
            background-color: red;

        }
        #t_left{
            width: 611px;
            height:376px;
            float: left;
        }
        #t_right{
            width: 375px;
            height: 376px;
            float: right;
         }
        body>div{
            width: 1000px;
            margin: 0 auto;/*元素居中*/

        }
        #b_left{
            width: 366px;
            height: 233px;
            float: left;


        }
        body>div>div{
            overflow: hidden;
            margin-bottom: 10px;
        }
        .b_right{
            width: 198px;
            height: 233px;
            float: right;
            margin-left: 10px;

        }


    </style>

</head>
<body>
<div>
    <div id="top_div">
        <div id="t_left"></div>
        <div id="t_right"></div>
    </div>
    <div id="b_div">
        <div id="b_left"></div>
        <div class="b_right"></div>
        <div class="b_right"></div>
        <div class="b_right"></div>
    </div>
</div>



</body>
</html>